Optical photographing lens assembly, image capturing device and electronic device

ABSTRACT

An optical photographing lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has refractive power. The third lens element has refractive power. The fourth lens element has refractive power. The fifth lens element with refractive power has an image-side surface being convex in a paraxial region thereof, wherein an object-side surface and the image-side surface of the fifth lens element are both aspheric. The sixth lens element with refractive power has an object-side surface and an image-side surface being both aspheric. The optical photographing lens assembly has a total of six lens elements with refractive power.

RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.16/798,486, filed on Feb. 24, 2020, which is a continuation of U.S.application Ser. No. 16/275,515, filed on Feb. 14, 2019, U.S. Pat. No.10,613,302, issued on Apr. 7, 2020, which is a continuation of U.S.application Ser. No. 15/632,510, filed on Jun. 26, 2017, U.S. Pat. No.10,241,303, issued on Mar. 26, 2019, which is a continuation of U.S.application Ser. No. 14/684,579, filed on Apr. 13, 2015, U.S. Pat. No.9,726,857 issued on Aug. 8, 2017, which claims priority to TaiwanApplication Serial Number 103146327, filed on Dec. 30, 2014, all ofwhich are herein incorporated by reference.

BACKGROUND Technical Field

The present disclosure relates to an optical photographing lens assemblyand an image capturing device. More particularly, the present disclosurerelates to a compact optical photographing lens assembly and imagecapturing device applicable to electronic devices.

Description of Related Art

In recent years, with the popularity of mobile terminals having camerafunctionalities, the demand of miniaturized optical systems has beenincreasing. The sensor of a conventional optical system is typically aCCD (Charge-Coupled Device) or a CMOS (ComplementaryMetal-Oxide-Semiconductor) sensor. As the advanced semiconductormanufacturing technologies have allowed the pixel size of sensors to bereduced and compact optical systems have gradually evolved toward thefield of higher megapixels, there is an increasing demand for compactoptical systems featuring better image quality.

A conventional optical system employed in a portable electronic productmainly adopts a four-element lens structure or a five-element lensstructure. Due to the popularity of mobile terminals with high-endspecifications, such as smart phones, tablet personal computers andwearable apparatus, the requirements for high resolution and imagequality of present compact optical systems increase significantly.However, the conventional optical systems cannot satisfy theserequirements of the compact optical systems.

Other conventional compact optical systems with six-element lensstructure enhance image quality and resolution. However, the arrangementof the refractive power of the first lens element in the optical systemdoes not give effect to shift the entire refractive powers toward theobject side, so that the arrangement of the small field of view and theshortened back focal length cannot be both obtained, and the stray lightwould be easily generated. Moreover, the shape of the fifth lens elementalso cannot reduce the generation of the stray light and is alsounfavorable for providing high image quality.

SUMMARY

According to one aspect of the present disclosure, an opticalphotographing lens assembly comprising, in order from an object side toan image side, a first lens element, a second lens element, a third lenselement, a fourth lens element, a fifth lens element, and a sixth lenselement. The first lens element with positive refractive power has anobject-side surface being convex in a paraxial region thereof. Thesecond lens element has refractive power. The third lens element hasrefractive power. The fourth lens element has refractive power. Thefifth lens element with refractive power has an image-side surface beingconvex in a paraxial region thereof, wherein an object-side surface andthe image-side surface of the fifth lens element are both aspheric. Thesixth lens element with refractive power has an object-side surface andan image-side surface being both aspheric. The optical photographinglens assembly has a total of six lens elements with refractive power.There is an air space between any two lens elements of the first lenselement, the second lens element, the third lens element, the fourthlens element, the fifth lens element and the sixth lens element that areadjacent to each other, and there is no relative movement among the lenselements with refractive power. The optical photographing lens assemblyfurther includes a stop located between an imaged object and the thirdlens element. When a focal length of the optical photographing lensassembly is f, a maximum image height of the optical photographing lensassembly is ImgH, and a curvature radius of the image-side surface ofthe fifth lens element is R10, the following conditions are satisfied:2.0<f/ImgH; and−1.25<R10/f<0.

According to another aspect of the present disclosure, an imagecapturing device includes the optical photographing lens assemblyaccording to the aforementioned aspect and an image sensor, wherein theimage sensor is disposed on an image surface of the opticalphotographing lens assembly.

According to further another aspect of the present disclosure, anelectronic device includes the image capturing device according to theaforementioned aspect.

According to yet another aspect of the present disclosure, an opticalphotographing lens assembly comprising, in order from an object side toan image side, a first lens element, a second lens element, a third lenselement, a fourth lens element, a fifth lens element, and a sixth lenselement. The first lens element with positive refractive power has anobject-side surface being convex in a paraxial region thereof. Thesecond lens element has refractive power. The third lens element hasrefractive power. The fourth lens element has refractive power. Thefifth lens element with refractive power has an image-side surface beingconvex in a paraxial region thereof, wherein an object-side surface andthe image-side surface of the fifth lens element are both aspheric. Thesixth lens element with refractive power has an image-side surface beingconcave in a paraxial region thereof, wherein an object-side surface andthe image-side surface of the sixth lens element are both aspheric. Theoptical photographing lens assembly has a total of six lens elementswith refractive power. There is an air space between any two lenselements of the first lens element, the second lens element, the thirdlens element, the fourth lens element, the fifth lens element and thesixth lens element that are adjacent to each other, and there is norelative movement among the lens elements with refractive power. Theoptical photographing lens assembly further includes a stop locatedbetween an imaged object and the third lens element. When a focal lengthof the optical photographing lens assembly is f, a maximum image heightof the optical photographing lens assembly is ImgH, and a curvatureradius of the image-side surface of the fifth lens element is R10, thefollowing conditions are satisfied:2.0<f/ImgH; andR10/f<0.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view of an image capturing device according to the1st embodiment of the present disclosure;

FIG. 2 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing device according to the 1stembodiment;

FIG. 3 is a schematic view of an image capturing device according to the2nd embodiment of the present disclosure;

FIG. 4 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing device according to the 2ndembodiment;

FIG. 5 is a schematic view of an image capturing device according to the3rd embodiment of the present disclosure;

FIG. 6 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing device according to the 3rdembodiment;

FIG. 7 is a schematic view of an image capturing device according to the4th embodiment of the present disclosure;

FIG. 8 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing device according to the 4thembodiment;

FIG. 9 is a schematic view of an image capturing device according to the5th embodiment of the present disclosure;

FIG. 10 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing device according to the 5thembodiment;

FIG. 11 is a schematic view of an image capturing device according tothe 6th embodiment of the present disclosure;

FIG. 12 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing device according to the 6thembodiment;

FIG. 13 shows a schematic view of the parameters Dr1s and Dsr2 of thefirst lens element of the optical photographing lens assembly in FIG. 1;

FIG. 14 is a schematic view of an electronic device according to the 7thembodiment of the present disclosure;

FIG. 15 is a schematic view of an electronic device according to the 8thembodiment of the present disclosure; and

FIG. 16 is a schematic view of an electronic device according to the 9thembodiment of the present disclosure.

DETAILED DESCRIPTION

An optical photographing lens assembly includes, in order from an objectside to an image side, a first lens element, a second lens element, athird lens element, a fourth lens element, a fifth lens element and asixth lens element, wherein the optical photographing lens assembly hasa total of six lens elements with refractive power, and there is norelative movement among the lens elements with refractive power. Theoptical photographing lens assembly further includes a stop, such as anaperture stop located between an imaged object and the third lenselement.

There is an air space between any two lens elements of the first lenselement, the second lens element, the third lens element, the fourthlens element, the fifth lens element and the sixth lens element that areadjacent to each other. That is, each of the first through sixth lenselements is a single and non-cemented lens element, and any two lenselements adjacent to each other are not cemented, and there is a spacebetween the two lens elements. Moreover, the manufacturing process ofthe cemented lenses is more complex than the non-cemented lenses. Inother words, of the first lens element, the second lens element, thethird lens element, the fourth lens element, the fifth lens element andthe sixth lens element of the optical photographing lens assembly, thereis a space in a paraxial region between every pair of lens elements thatare adjacent to each other. In particular, a second surface of one lenselement and a first surface of the following lens element need to haveaccurate curvature to ensure these two lens elements will be highlycemented. However, during the cementing process, those two lens elementsmight not be highly cemented due to displacement and it is thereby notfavorable for the image quality of the optical photographing lensassembly. Therefore, according to the optical photographing lensassembly of the present disclosure, an air space in a paraxial regionbetween any two of the first lens element, the second lens element, thethird lens element, the fourth lens element, the fifth lens element andthe sixth lens element that are adjacent to each other of the presentdisclosure improves the problem generated by the cemented lens elements.

The first lens element with positive refractive power has an object-sidesurface being convex in a paraxial region thereof. By such arrangement,the entire refractive powers of the optical photographing lens assemblycan be given effect to shift towards the object side thereof, thereforethe back focal length thereof can be reduced and the arrangement of thesmall field of view can be obtained for reducing the incident angle ofthe light. Hence, the stray light, such as the light generated by thespecular reflection, can be avoided.

The second lens element can have negative refractive power, so that theaberration of the optical photographing lens assembly can be correctedfor enhancing the image quality.

The third lens element can have an image-side surface being concave in aparaxial region thereof, so that the aberration of the opticalphotographing lens assembly can be corrected.

The fifth lens element can have positive refractive power, and has animage-side surface being convex in a paraxial region thereof. Therefore,the photosensitivity of the optical photographing lens assembly can bereduced. Further, the surface shape in the paraxial region of theimage-side surface of the fifth lens element is also favorable fordecreasing the stray light and enhancing the moldability of the lenselement by reducing the variation of the surface shape of the fifth lenselement.

The sixth lens element can have an image-side surface being concave in aparaxial region thereof and include at least one convex shape in anoff-axial region thereof. Therefore, the principal point can bepositioned away from the image surface of the optical photographing lensassembly so as to reduce the back focal length for keeping a compactsize. Further, it is also favorable for reducing the incident angle ofthe off-axis field onto the image sensor so as to increase theresponding efficiency of the image sensor.

According to the optical photographing lens assembly of the presentdisclosure, at least three surfaces of the object-side surface and theimage-side surface of each of the first lens element, the second lenselement, the third lens element, the fourth lens element and the fifthlens element have at least one inflection point. Therefore, theastigmatism and the aberration of the off-axis field can be effectivelycorrected.

Furthermore, according to the optical photographing lens assembly of thepresent disclosure, at least three lens elements of the first lenselement, the second lens element, the third lens element, the fourthlens element, the fifth lens element and the sixth lens element havenegative refractive power. Therefore, the aberration of the opticalphotographing lens assembly can be corrected for maintaining the imagequality.

When a focal length of the optical photographing lens assembly is f, anda maximum image height of the optical photographing lens assembly isImgH, the following condition is satisfied: 2.0<f/ImgH. Therefore, it isfavorable for enhancing the image capturing ability on a specific regionand obtaining the excellent telephoto ability by controlling theincident light of the optical photographing lens assembly which can befocused at a far and specific region. Preferably, the followingcondition can be satisfied: 2.15<f/ImgH<3.5.

When the focal length of the optical photographing lens assembly is f,and a curvature radius of the image-side surface of the fifth lenselement is R10, the following condition is satisfied: R10/f<0.Therefore, the surface shape in the paraxial region of the image-sidesurface of the fifth lens element is favorable for decreasing the straylight and enhancing the moldability of the lens element by decreasingthe variation of the surface shape of the fifth lens element.Preferably, the following condition can be satisfied: −1.25<R10/f<0.More preferably, the following condition can be satisfied:−1.0<R10/f<−0.1.

When half of a maximal field of view of the optical photographing lensassembly is HFOV, the following condition is satisfied: 10.0degrees<HFOV<25.0 degrees. Therefore, it is favorable for avoiding thegeneration of the stray light through proper field of view and the imagecapturing range.

When an axial distance between the first lens element and the secondlens element is T12, an axial distance between the second lens elementand the third lens element is T23, an axial distance between the thirdlens element and the fourth lens element is T34, an axial distancebetween the fourth lens element and the fifth lens element is T45, anaxial distance between the fifth lens element and the sixth lens elementis T56, and a sum of axial distances between each two lens elements ofthe first lens element, the second lens element, the third lens element,the fourth lens element, the fifth lens element and the sixth lenselement which are adjacent to each other is ΣAT(ΣAT=T12+T23+T34+T45+T56), the following condition is satisfied:5.0<ΣAT/(T12+T23). Therefore, it is favorable for assembling the lenselements so as to increase the manufacturing yield rate.

When an axial distance from the object-side surface of the first lenselement to the stop is Dr1s (when the axial point on the object-sidesurface of the first lens element is closer to the object side than thecenter of the stop, Dr1s is a positive value; when the axial point onthe object-side surface of the first lens element is closer to the imageside than the center of the stop, Dr1s is a negative value), an axialdistance from the stop to an image-side surface of the first lenselement is Dsr2 (when the center of the stop is closer to the objectside than the axial point on the image-side surface of the first lenselement, Dsr2 is a positive value; when the center of the stop is closerto the image side than the axial point on the image-side surface of thefirst lens element, Dsr2 is a negative value), and the followingcondition is satisfied: 0.60<Dr1s/Dsr2. Therefore, the variation of therefracted angle of the incident light can be reduced and the stray lightcan be also reduced since the first lens element shifts the refractivepowers of the optical photographing lens assembly towards the objectside.

When the focal length of the optical photographing lens assembly is f,and an axial distance between the object-side surface of the first lenselement and an image surface is TL, the following condition issatisfied: 0.70<TL/f<1.15. Therefore, it is favorable for keeping theoptical photographing lens assembly compact.

When an axial distance between the stop and the image surface is SL, theaxial distance between the object-side surface of the first lens elementand the image surface is TL, the following condition is satisfied:0.85<SL/TL<1.05. Therefore, it is favorable for obtaining a balancebetween telecentricity and the functionality of wide viewing angle, andthereby the total track length will not be excessively long.

When an Abbe number of the first lens element is V1, an Abbe number ofthe second lens element is V2, an Abbe number of the third lens elementis V3, an Abbe number of the fourth lens element is V4, an Abbe numberof the fifth lens element is V5, an Abbe number of the sixth lenselement is V6, wherein at least two of the V1, V2, V3, V4, V5 and V6 aresmaller than 27. Therefore, it is favorable for correcting the chromaticaberration of the optical photographing lens assembly.

According to the optical photographing lens assembly of the presentdisclosure, the lens elements thereof can be made of glass or plasticmaterial. When the lens elements are made of glass material, thedistribution of the refractive powers of the optical photographing lensassembly may be more flexible to design. When the lens elements are madeof plastic material, the manufacturing cost can be effectively reduced.Furthermore, surfaces of each lens element can be arranged to beaspheric, since the aspheric surface of the lens element is easy to forma shape other than spherical surface so as to have more controllablevariables for eliminating the aberration thereof, and to furtherdecrease the required number of the lens elements. Therefore, the totaltrack length of the optical photographing lens assembly can also bereduced.

According to the optical photographing lens assembly of the presentdisclosure, each of an object-side surface and an image-side surface hasa paraxial region and an off-axis region. The paraxial region refers tothe region of the surface where light rays travel close to the opticalaxis, and the off-axis region refers to the region of the surface awayfrom the paraxial region. Particularly, when the lens element has aconvex surface, it indicates that the surface is convex in the paraxialregion thereof; when the lens element has a concave surface, itindicates that the surface is concave in the paraxial region thereof.

According to the optical photographing lens assembly of the presentdisclosure, the positive refractive power or the negative refractivepower of a lens element or the focal length of the lens element, thatis, refers to the refractive power or the focal length in a paraxialregion of the lens element.

According to the optical photographing lens assembly of the presentdisclosure, the optical photographing lens assembly can include at leastone stop, such as an aperture stop, a glare stop or a field stop. Saidglare stop or said field stop is for eliminating the stray light andthereby improving the image resolution thereof.

According to the optical photographing lens assembly of the presentdisclosure, an image surface of the optical photographing lens assembly,based on the corresponding image sensor, can be flat or curved. Inparticular, the image surface can be a curved surface being concavefacing towards the object side.

According to the optical photographing lens assembly of the presentdisclosure, an aperture stop can be configured as a front stop or amiddle stop. A front stop disposed between an imaged object and thefirst lens element can provide a longer distance between an exit pupilof the optical photographing lens assembly and the image surface andthereby improves the image-sensing efficiency of an image sensor. Amiddle stop disposed between the first lens element and the imagesurface is favorable for enlarging the field of view of the opticalphotographing lens assembly and thereby provides a wider field of viewfor the same.

According to the optical photographing lens assembly of the presentdisclosure, the optical photographing lens assembly can be applied to 3D(three-dimensional) image capturing applications, in products such asdigital cameras, mobile devices, digital tablets, smart TV, internetmonitoring device, motion sensing input device, driving recordingsystems, rear view camera systems, and wearable devices.

According to the present disclosure, an image capturing device isprovided. The image capturing device includes the aforementioned opticalphotographing lens assembly and an image sensor, wherein the imagesensor is disposed on the image side of the aforementioned opticalphotographing lens assembly, that is, the image sensor can be disposedon or near an image surface of the aforementioned optical photographinglens assembly. In the image capturing device, by the arrangement of therefractive power of the first lens element, the entire refractive powersof the optical photographing lens assembly can be given effect to shifttowards the object side thereof, and it is favorable for reducing theback focal length and reducing the variation of the refraction anglewhen the lights enter the optical photographing lens assembly. Hence,the stray light, such as the light generated by the specular reflection,can be avoided. Furthermore, the surface shape in the paraxial region ofthe image-side surface of the fifth lens element is also favorable fordecreasing the stray light and enhancing the moldability of the lenselement by reducing the variation of the surface shape of the fifth lenselement. Preferably, the image capturing device can further include abarrel member, a holding member or a combination thereof.

According to the present disclosure, an electronic device is provided.The electronic device includes the aforementioned image capturingdevice. Therefore, the image quality of the electronic device can beincreased. Preferably, the electronic device can further include but notlimited to a control unit, a display, a storage unit, a random accessmemory unit (RAM), a read only memory unit (ROM) or a combinationthereof.

According to the above description of the present disclosure, thefollowing 1st-9th specific embodiments are provided for furtherexplanation.

1st Embodiment

FIG. 1 is a schematic view of an image capturing device according to the1st embodiment of the present disclosure. FIG. 2 shows sphericalaberration curves, astigmatic field curves and a distortion curve of theimage capturing device according to the 1st embodiment. In FIG. 1 , theimage capturing device includes an optical photographing lens assembly(its reference numeral is omitted) and an image sensor 190. The opticalphotographing lens assembly includes, in order from an object side to animage side, an aperture stop 100, a first lens element 110, a secondlens element 120, a third lens element 130, a fourth lens element 140, afifth lens element 150, a sixth lens element 160, an IR-cut filter 170and an image surface 180, wherein the image sensor 190 is disposed onthe image surface 180 of the optical photographing lens assembly. Theoptical photographing lens assembly has a total of six lens elements(110-160) with refractive power. There is an air space in a paraxialregion between any two of the first lens element 110, the second lenselement 120, the third lens element 130, the fourth lens element 140,the fifth lens element 150, and the sixth lens element 160 that areadjacent to each other, and there is no relative movement among the lenselements (110-160) with refractive power.

The first lens element 110 with positive refractive power has anobject-side surface 111 being convex in a paraxial region thereof and animage-side surface 112 being concave in a paraxial region thereof. Thefirst lens element 110 is made of plastic material, and has theobject-side surface 111 and the image-side surface 112 being bothaspheric.

The second lens element 120 with negative refractive power has anobject-side surface 121 being convex in a paraxial region thereof and animage-side surface 122 being concave in a paraxial region thereof. Thesecond lens element 120 is made of plastic material, and has theobject-side surface 121 and the image-side surface 122 being bothaspheric. Furthermore, both of the object-side surface 121 and theimage-side surface 122 of the second lens element 120 have at least oneinflection point.

The third lens element 130 with positive refractive power has anobject-side surface 131 being convex in a paraxial region thereof and animage-side surface 132 being convex in a paraxial region thereof. Thethird lens element 130 is made of plastic material, and has theobject-side surface 131 and the image-side surface 132 being bothaspheric. Furthermore, both of the object-side surface 131 and theimage-side surface 132 of the third lens element 130 have at least oneinflection point.

The fourth lens element 140 with positive refractive power has anobject-side surface 141 being convex in a paraxial region thereof and animage-side surface 142 being concave in a paraxial region thereof. Thefourth lens element 140 is made of plastic material, and has theobject-side surface 141 and the image-side surface 142 being bothaspheric. Furthermore, both of the object-side surface 141 and theimage-side surface 142 of the fourth lens element 140 have at least oneinflection point.

The fifth lens element 150 with positive refractive power has anobject-side surface 151 being concave in a paraxial region thereof andan image-side surface 152 being convex in a paraxial region thereof. Thefifth lens element 150 is made of plastic material, and has theobject-side surface 151 and the image-side surface 152 being bothaspheric. Furthermore, the image-side surface 152 of the fifth lenselement 150 has at least one inflection point.

The sixth lens element 160 with negative refractive power has anobject-side surface 161 being concave in a paraxial region thereof andan image-side surface 162 being concave in a paraxial region thereof.The sixth lens element 160 is made of plastic material, and has theobject-side surface 161 and the image-side surface 162 being bothaspheric. Furthermore, the image-side surface 162 of the sixth lenselement 160 includes at least one convex shape in an off-axial regionthereof.

The IR-cut filter 170 is made of glass material and located between thesixth lens element 160 and the image surface 180, and will not affect afocal length of the optical photographing lens assembly.

The equation of the aspheric surface profiles of the aforementioned lenselements of the 1st embodiment is expressed as follows:

${{X(Y)} = {{\left( {Y^{2}/R} \right)/\left( {1 + {{sqrt}\left( {1 - {\left( {1 + k} \right) \times \left( {Y/R} \right)^{2}}} \right)}} \right)} + {\sum\limits_{i}{({Ai}) \times \left( Y^{i} \right)}}}},$where,

X is the relative distance between a point on the aspheric surfacespaced at a distance Y from the optical axis and the tangential plane atthe aspheric surface vertex on the optical axis;

Y is the vertical distance from the point on the aspheric surface to theoptical axis;

R is the curvature radius;

k is the conic coefficient; and

Ai is the i-th aspheric coefficient.

In the optical photographing lens assembly according to the 1stembodiment, when a focal length of the optical photographing lensassembly is f, an f-number of the optical photographing lens assembly isFno, and half of a maximal field of view of the optical photographinglens assembly is HFOV, these parameters have the following values:f=6.61 mm; Fno=2.35; and HFOV=23.0 degrees.

FIG. 13 shows a schematic view of the parameters Dr1s and Dsr2 of thefirst lens element 110 of the optical photographing lens assembly inFIG. 1 . In FIG. 13 , when an axial distance from the object-sidesurface 111 of the first lens element 110 to the aperture stop 100 isDr1s, and an axial distance from the aperture stop 100 to the image-sidesurface 112 of the first lens element 110 is Dsr2, the followingcondition is satisfied: Dr1s/Dsr2=2.46.

In the optical photographing lens assembly according to the 1stembodiment, when a sum of axial distances between each two lens elementsof the first lens element 110, the second lens element 120, the thirdlens element 130, the fourth lens element 140, the fifth lens element150 and the sixth lens element 160 which are adjacent to each other isΣAT, an axial distance between the first lens element 110 and the secondlens element 120 is T12, and an axial distance between the second lenselement 120 and the third lens element 130 is T23, the followingcondition is satisfied: ΣAT/(T12+T23)=5.52.

In the optical photographing lens assembly according to the 1stembodiment, when an axial distance between the aperture stop 100 and theimage surface 180 is SL, and an axial distance between the object-sidesurface 111 of the first lens element 110 and the image surface 180 isTL, the following condition is satisfied: SL/TL=0.95.

In the optical photographing lens assembly according to the 1stembodiment, when the focal length of the optical photographing lensassembly is f, and a maximum image height of the optical photographinglens assembly is ImgH (half of a diagonal length of an effectivephotosensitive area of the image sensor 190), the following condition issatisfied: f/ImgH=2.25.

In the optical photographing lens assembly according to the 1stembodiment, when the focal length of the optical photographing lensassembly is f, and the axial distance between the object-side surface111 of the first lens element 110 and the image surface 180 is TL, thefollowing condition is satisfied: TL/f=1.04.

In the optical photographing lens assembly according to the 1stembodiment, when the focal length of the optical photographing lensassembly is f, and a curvature radius of the image-side surface 152 ofthe fifth lens element 150 is R10, the following condition is satisfied:R10/f=−0.61.

In the optical photographing lens assembly according to the 1stembodiment, when an Abbe number of the first lens element 110 is V1, anAbbe number of the second lens element 120 is V2, an Abbe number of thethird lens element 130 is V3, an Abbe number of the fourth lens element140 is V4, an Abbe number of the fifth lens element 150 is V5, and anAbbe number of the sixth lens element 160 is V6, wherein at least two ofthe V1, V2, V3, V4, V5 and V6 are smaller than 27, and in the 1stembodiment, V2, V4 and V5 are smaller than 27.

The detailed optical data of the 1st embodiment are shown in Table 1 andthe aspheric surface data are shown in Table 2 below.

TABLE 1 1st Embodiment f = 6.61 mm, Fno = 2.35, HFOV = 23.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.340  2 Lens 1 3.330 ASP 0.478Plastic 1.514 56.8 6.70 3 98.781 ASP 0.125 4 Lens 2 1.566 ASP 0.240Plastic 1.639 23.5 −6.19 5 1.055 ASP 0.136 6 Lens 3 3.106 ASP 0.931Plastic 1.544 55.9 5.34 7 −40.867 ASP 0.151 8 Lens 4 3.678 ASP 0.502Plastic 1.639 23.5 24.21 9 4.569 ASP 0.502 10 Lens 5 −3.999 ASP 0.482Plastic 1.639 23.5 159.69 11 −4.029 ASP 0.528 12 Lens 6 −14.182 ASP0.680 Plastic 1.535 55.7 −6.31 13 4.502 ASP 0.500 14 IR-cut filter Plano0.210 Glass 1.517 64.2 — 15 Plano 1.376 16 Image Plano — Note: Referencewavelength is 587.6 nm (d-line).

TABLE 2 Aspheric Coefficients Surface # 2 3 4 5 6 7 k= 3.4923E+00−9.0000E+01 −6.3774E+00 −3.5499E+00 8.1821E−01 9.0000E+01 A4= 3.0834E−02 2.6140E−02 −1.6394E−01 −1.3995E−01 3.3134E−02 4.9508E−02 A6=−8.0200E−02  −2.5567E−02  1.0936E−01  1.1578E−01 −1.8676E−02  5.5933E−03A8= 8.8754E−02  2.5292E−02 −3.5261E−02 −4.3736E−02 2.9275E−02−2.7465E−02  A10= −6.1718E−02  −1.5997E−02  3.9652E−03  1.1105E−02−2.2565E−02  1.5461E−02 A12= 2.1671E−02  5.0245E−03  1.7848E−03−2.7668E−03 7.6815E−03 −4.9880E−03  A14= −2.9876E−03  −2.7579E−04−6.1482E−04  2.6249E−04 −1.0763E−03  6.7912E−04 Surface # 8 9 10 11 1213 k= −2.5971E+00 −1.4832E+01 4.2223E−01 −5.9107E+00 1.4384E+01−6.6561E+01 A4= −1.4601E−02 −4.3637E−02 −4.6915E−03  −2.1833E−03−1.6731E−01  −5.3762E−02 A6=  4.6484E−02  7.9441E−02 1.1363E−01 9.7161E−02 1.3640E−01  5.3248E−03 A8= −5.9632E−02 −8.9278E−02−1.5486E−01  −8.6550E−02 −1.4661E−01   2.8656E−03 A10=  4.4888E−02 6.3478E−02 9.4633E−02  3.0844E−02 1.0615E−01 −2.4947E−03 A12=−1.7382E−02 −2.3873E−02 −3.8329E−02  −8.0901E−03 −4.8064E−02  6.5169E−04 A14=  2.4484E−03  3.1987E−03 7.3400E−03  1.9784E−038.9165E−03 −5.9390E−05

In Table 1, the curvature radius, the thickness and the focal length areshown in millimeters (mm). Surface numbers 0-16 represent the surfacessequentially arranged from the object-side to the image-side along theoptical axis. In Table 2, k represents the conic coefficient of theequation of the aspheric surface profiles. A4-A14 represent the asphericcoefficients ranging from the 4th order to the 14th order. The tablespresented below for each embodiment are the corresponding schematicparameter and aberration curves, and the definitions of the tables arethe same as Table 1 and Table 2 of the 1st embodiment. Therefore, anexplanation in this regard will not be provided again.

2nd Embodiment

FIG. 3 is a schematic view of an image capturing device according to the2nd embodiment of the present disclosure. FIG. 4 shows sphericalaberration curves, astigmatic field curves and a distortion curve of theimage capturing device according to the 2nd embodiment. In FIG. 3 , theimage capturing device includes an optical photographing lens assembly(its reference numeral is omitted) and an image sensor 290. The opticalphotographing lens assembly includes, in order from an object side to animage side, an aperture stop 200, a first lens element 210, a secondlens element 220, a third lens element 230, a fourth lens element 240, afifth lens element 250, a sixth lens element 260, an IR-cut filter 270and an image surface 280, wherein the image sensor 290 is disposed onthe image surface 280 of the optical photographing lens assembly. Theoptical photographing lens assembly has a total of six lens elements(210-260) with refractive power. There is an air space in a paraxialregion between any two of the first lens element 210, the second lenselement 220, the third lens element 230, the fourth lens element 240,the fifth lens element 250, and the sixth lens element 260 that areadjacent to each other, and there is no relative movement among the lenselements (210-260) with refractive power.

The first lens element 210 with positive refractive power has anobject-side surface 211 being convex in a paraxial region thereof and animage-side surface 212 being convex in a paraxial region thereof. Thefirst lens element 210 is made of plastic material, and has theobject-side surface 211 and the image-side surface 212 being bothaspheric. Furthermore, the image-side surface 212 of the first lenselement 210 has at least one inflection point.

The second lens element 220 with negative refractive power has anobject-side surface 221 being convex in a paraxial region thereof and animage-side surface 222 being concave in a paraxial region thereof. Thesecond lens element 220 is made of plastic material, and has theobject-side surface 221 and the image-side surface 222 being bothaspheric. Furthermore, both of the object-side surface 221 and theimage-side surface 222 of the second lens element 220 have at least oneinflection point.

The third lens element 230 with positive refractive power has anobject-side surface 231 being convex in a paraxial region thereof and animage-side surface 232 being convex in a paraxial region thereof. Thethird lens element 230 is made of plastic material, and has theobject-side surface 231 and the image-side surface 232 being bothaspheric. Furthermore, both of the object-side surface 231 and theimage-side surface 232 of the third lens element 230 have at least oneinflection point.

The fourth lens element 240 with negative refractive power has anobject-side surface 241 being convex in a paraxial region thereof and animage-side surface 242 being concave in a paraxial region thereof. Thefourth lens element 240 is made of plastic material, and has theobject-side surface 241 and the image-side surface 242 being bothaspheric. Furthermore, the object-side surface 241 of the fourth lenselement 240 has at least one inflection point.

The fifth lens element 250 with positive refractive power has anobject-side surface 251 being concave in a paraxial region thereof andan image-side surface 252 being convex in a paraxial region thereof. Thefifth lens element 250 is made of plastic material, and has theobject-side surface 251 and the image-side surface 252 being bothaspheric. Furthermore, both of the object-side surface 251 and theimage-side surface 252 of the fifth lens element 250 have at least oneinflection point.

The sixth lens element 260 with negative refractive power has anobject-side surface 261 being concave in a paraxial region thereof andan image-side surface 262 being concave in a paraxial region thereof.The sixth lens element 260 is made of plastic material, and has theobject-side surface 261 and the image-side surface 262 being bothaspheric. Furthermore, the image-side surface 262 of the sixth lenselement 260 includes at least one convex shape in an off-axial regionthereof.

The IR-cut filter 270 is made of glass material and located between thesixth lens element 260 and the image surface 280, and will not affect afocal length of the optical photographing lens assembly.

The detailed optical data of the 2nd embodiment are shown in Table 3 andthe aspheric surface data are shown in Table 4 below.

TABLE 3 2nd Embodiment f = 6.89 mm, Fno = 2.25, HFOV = 22.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.505  2 Lens 1 3.199 ASP 0.545Plastic 1.514 56.8 5.43 3 −20.490 ASP 0.074 4 Lens 2 1.640 ASP 0.240Plastic 1.607 26.6 −4.97 5 1.004 ASP 0.191 6 Lens 3 4.200 ASP 1.214Plastic 1.535 55.7 4.63 7 −5.432 ASP 0.161 8 Lens 4 5.371 ASP 0.490Plastic 1.633 23.4 −230.11 9 4.997 ASP 0.509 10 Lens 5 −2.984 ASP 0.425Plastic 1.544 55.9 13.33 11 −2.220 ASP 0.560 12 Lens 6 −2.561 ASP 1.180Plastic 1.514 56.8 −4.45 13 24.486 ASP 0.500 14 IR-cut filter Plano0.300 Glass 1.517 64.2 — 15 Plano 1.119 16 Image Plano — Note: Referencewavelength is 587.6 nm (d-line).

TABLE 4 Aspheric Coefficients Surface # 2 3 4 5 6 7 k= 2.8239E+008.9147E+01 −1.1224E+01 −4.4175E+00 −6.1594E+00 8.1794E+00 A4= 3.8374E−025.7482E−02 −1.4842E−01 −1.3192E−01  2.4180E−02 5.2719E−02 A6=−7.8277E−02  −2.8601E−02   1.0371E−01  1.1926E−01 −4.0176E−03 6.0477E−03A8= 9.0692E−02 2.3072E−02 −3.5240E−02 −4.3925E−02  3.0114E−02−2.6143E−02  A10= −6.1960E−02  −1.4594E−02   4.1020E−03  1.1435E−02−2.3491E−02 1.5857E−02 A12= 2.1337E−02 5.5530E−03  1.8738E−03−2.6553E−03  7.4319E−03 −4.9628E−03  A14= −2.9015E−03  −6.1040E−04 −5.4547E−04  2.2512E−04 −9.8502E−04 6.3149E−04 Surface # 8 9 10 11 12 13k= −4.7768E+00 −6.0097E+00 −1.9238E+00  −4.3382E+00  1.1359E+00−6.6561E+01 A4= −1.9463E−02 −7.4264E−02 3.6451E−03 4.9927E−02 7.6160E−02 7.3668E−03 A6=  5.0089E−02  8.4701E−02 1.2116E−01 8.6713E−02−2.4190E−02  −8.8608E−03 A8= −6.0299E−02 −7.4656E−02 −1.4981E−01 −8.6257E−02  −1.8063E−03   2.5654E−03 A10=  4.5370E−02  5.9696E−029.6649E−02 3.3712E−02 6.9843E−03 −4.4452E−04 A12= −1.7351E−02−2.5217E−02 −3.8377E−02  −8.1780E−03  −3.1180E−03   4.4498E−05 A14= 2.3872E−03  3.9672E−03 6.6552E−03 1.2685E−03 5.9370E−04 −1.8784E−06

In the 2nd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 2nd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 3 and Table 4 asthe following values and satisfy the following conditions:

2nd Embodiment f [mm] 6.89 SL/TL 0.93 Fno 2.25 f/ImgH 2.35 HFOV [deg.]22.0 TL/f 1.09 Dr1s/Dsr2 12.63 R10/f −0.32 ΣAT/(T12 + T23) 5.64

Moreover, in the optical photographing lens assembly according to the2nd embodiment, when an Abbe number of the first lens element 210 is V1,an Abbe number of the second lens element 220 is V2, an Abbe number ofthe third lens element 230 is V3, an Abbe number of the fourth lenselement 240 is V4, an Abbe number of the fifth lens element 250 is V5,and an Abbe number of the sixth lens element 260 is V6, wherein at leasttwo of the V1, V2, V3, V4, V5 and V6 are smaller than 27, and in the 2ndembodiment, V2 and V4 are smaller than 27.

3rd Embodiment

FIG. 5 is a schematic view of an image capturing device according to the3rd embodiment of the present disclosure. FIG. 6 shows sphericalaberration curves, astigmatic field curves and a distortion curve of theimage capturing device according to the 3rd embodiment. In FIG. 5 , theimage capturing device includes an optical photographing lens assembly(its reference numeral is omitted) and an image sensor 390. The opticalphotographing lens assembly includes, in order from an object side to animage side, a first lens element 310, an aperture stop 300, a secondlens element 320, a third lens element 330, a fourth lens element 340, afifth lens element 350, a sixth lens element 360, an IR-cut filter 370and an image surface 380, wherein the image sensor 390 is disposed onthe image surface 380 of the optical photographing lens assembly. Theoptical photographing lens assembly has a total of six lens elements(310-360) with refractive power. There is an air space in a paraxialregion between any two of the first lens element 310, the second lenselement 320, the third lens element 330, the fourth lens element 340,the fifth lens element 350, and the sixth lens element 360 that areadjacent to each other, and there is no relative movement among the lenselements (310-360) with refractive power.

The first lens element 310 with positive refractive power has anobject-side surface 311 being convex in a paraxial region thereof and animage-side surface 312 being convex in a paraxial region thereof. Thefirst lens element 310 is made of plastic material, and has theobject-side surface 311 and the image-side surface 312 being bothaspheric. Furthermore, the image-side surface 312 of the first lenselement 310 has at least one inflection point.

The second lens element 320 with positive refractive power has anobject-side surface 321 being convex in a paraxial region thereof and animage-side surface 322 being convex in a paraxial region thereof. Thesecond lens element 320 is made of plastic material, and has theobject-side surface 321 and the image-side surface 322 being bothaspheric.

The third lens element 330 with negative refractive power has anobject-side surface 331 being concave in a paraxial region thereof andan image-side surface 332 being concave in a paraxial region thereof.The third lens element 330 is made of plastic material, and has theobject-side surface 331 and the image-side surface 332 being bothaspheric. Furthermore, both of the object-side surface 331 and theimage-side surface 332 of the third lens element 330 have at least oneinflection point.

The fourth lens element 340 with negative refractive power has anobject-side surface 341 being concave in a paraxial region thereof andan image-side surface 342 being concave in a paraxial region thereof.The fourth lens element 340 is made of plastic material, and has theobject-side surface 341 and the image-side surface 342 being bothaspheric. Furthermore, both of the object-side surface 341 and theimage-side surface 342 of the fourth lens element 340 have at least oneinflection point.

The fifth lens element 350 with positive refractive power has anobject-side surface 351 being concave in a paraxial region thereof andan image-side surface 352 being convex in a paraxial region thereof. Thefifth lens element 350 is made of plastic material, and has theobject-side surface 351 and the image-side surface 352 being bothaspheric. Furthermore, both of the object-side surface 351 and theimage-side surface 352 of the fifth lens element 350 have at least oneinflection point.

The sixth lens element 360 with negative refractive power has anobject-side surface 361 being convex in a paraxial region thereof and animage-side surface 362 being concave in a paraxial region thereof. Thesixth lens element 360 is made of plastic material, and has theobject-side surface 361 and the image-side surface 362 being bothaspheric. Furthermore, the image-side surface 362 of the sixth lenselement 360 includes at least one convex shape in an off-axial regionthereof.

The IR-cut filter 370 is made of glass material and located between thesixth lens element 360 and the image surface 380, and will not affect afocal length of the optical photographing lens assembly.

The detailed optical data of the 3rd embodiment are shown in Table 5 andthe aspheric surface data are shown in Table 6 below.

TABLE 5 3rd Embodiment f = 5.67 mm, Fno = 2.50, HFOV = 21.8 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 7.974 ASP 0.344 Plastic 1.544 55.9 11.412 −27.592 ASP 0.380 3 Ape. Stop Plano −0.330  4 Lens 2 2.107 ASP 0.737Plastic 1.544 55.9 2.87 5 −5.262 ASP 0.050 6 Lens 3 −6.617 ASP 0.604Plastic 1.639 23.5 −4.23 7 4.726 ASP 0.261 8 Lens 4 −4.599 ASP 0.250Plastic 1.544 55.9 −5.71 9 9.785 ASP 0.912 10 Lens 5 −7.411 ASP 1.070Plastic 1.544 55.9 4.89 11 −2.059 ASP 0.611 12 Lens 6 29.111 ASP 0.300Plastic 1.544 55.9 −4.36 13 2.187 ASP 0.500 14 IR-cut filter Plano 0.210Glass 1.517 64.2 — 15 Plano 0.301 16 Image Plano — Note: Referencewavelength is 587.6 nm (d-line).

TABLE 6 Aspheric Coefficients Surface # 1 2 4 5 6 7 k= −7.9010E+019.1739E−01 −1.4014E−01 1.3679E+01 −6.9708E+01 2.1230E+00 A4= −6.9006E−03−8.0306E−03   2.0317E−02 6.9432E−02  4.5340E−02 4.3292E−03 A6=−1.0269E−04 7.3759E−03  5.9327E−03 −1.5595E−01  −1.6152E−01 6.0184E−02A8=  2.3250E−03 5.9120E−04 −2.0822E−02 2.3155E−01  3.0045E−01−1.9558E−01  A10=  2.5859E−04 5.0612E−04  1.8982E−02 −1.5381E−01 −2.2475E−01 5.0799E−01 A12= −5.5756E−05 2.3478E−04 −6.3485E−033.7747E−02  5.9297E−02 −3.0524E−01  Surface # 8 9 10 11 12 13 k=1.9204E+01  7.7817E+01  2.8897E+01 −7.2997E−01 5.2877E+01 −3.5067E−01A4= 8.2676E−02  9.6455E−02 −1.7245E−02 −5.6433E−04 −1.9217E−01 −2.4131E−01 A6= −2.4804E−02  −1.3812E−02 −3.4418E−02 −4.3030E−023.6571E−02  9.6363E−02 A8= 4.0809E−02 −9.0362E−03  1.1080E−02 2.5351E−02 1.4000E−02 −3.2234E−02 A10= 2.5453E−01  1.1899E−01−3.0037E−03 −9.0950E−03 −6.2321E−03   7.8495E−03 A12= −1.9722E−01 −9.7470E−02  4.0209E−03  1.6533E−03 6.7530E−04 −1.1766E−03 A14= 7.6075E−05

In the 3rd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 3rd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 5 and Table 6 asthe following values and satisfy the following conditions:

3rd Embodiment f [mm] 5.67 SL/TL 0.88 Fno 2.50 f/ImgH 2.48 HFOV [deg.]21.8 TL/f 1.09 Dr1s/Dsr2 −1.91 R10/f −0.36 ΣAT/(T12 + T23) 18.84

4th Embodiment

FIG. 7 is a schematic view of an image capturing device according to the4th embodiment of the present disclosure. FIG. 8 shows sphericalaberration curves, astigmatic field curves and a distortion curve of theimage capturing device according to the 4th embodiment. In FIG. 7 , theimage capturing device includes an optical photographing lens assembly(its reference numeral is omitted) and an image sensor 490. The opticalphotographing lens assembly includes, in order from an object side to animage side, an aperture stop 400, a first lens element 410, a secondlens element 420, a third lens element 430, a fourth lens element 440, afifth lens element 450, a sixth lens element 460, an IR-cut filter 470and an image surface 480, wherein the image sensor 490 is disposed onthe image surface 480 of the optical photographing lens assembly. Theoptical photographing lens assembly has a total of six lens elements(410-460) with refractive power. There is an air space in a paraxialregion between any two of the first lens element 410, the second lenselement 420, the third lens element 430, the fourth lens element 440,the fifth lens element 450, and the sixth lens element 460 that areadjacent to each other, and there is no relative movement among the lenselements (410-460) with refractive power.

The first lens element 410 with positive refractive power has anobject-side surface 411 being convex in a paraxial region thereof and animage-side surface 412 being convex in a paraxial region thereof. Thefirst lens element 410 is made of plastic material, and has theobject-side surface 411 and the image-side surface 412 being bothaspheric. Furthermore, the image-side surface 412 of the first lenselement 410 has at least one inflection point.

The second lens element 420 with negative refractive power has anobject-side surface 421 being convex in a paraxial region thereof and animage-side surface 422 being concave in a paraxial region thereof. Thesecond lens element 420 is made of plastic material, and has theobject-side surface 421 and the image-side surface 422 being bothaspheric. Furthermore, the object-side surface 421 of the second lenselement 420 has at least one inflection point.

The third lens element 430 with negative refractive power has anobject-side surface 431 being convex in a paraxial region thereof and animage-side surface 432 being concave in a paraxial region thereof. Thethird lens element 430 is made of plastic material, and has theobject-side surface 431 and the image-side surface 432 being bothaspheric.

The fourth lens element 440 with positive refractive power has anobject-side surface 441 being concave in a paraxial region thereof andan image-side surface 442 being convex in a paraxial region thereof. Thefourth lens element 440 is made of plastic material, and has theobject-side surface 441 and the image-side surface 442 being bothaspheric. Furthermore, the image-side surface 442 of the fourth lenselement 440 has at least one inflection point.

The fifth lens element 450 with positive refractive power has anobject-side surface 451 being concave in a paraxial region thereof andan image-side surface 452 being convex in a paraxial region thereof. Thefifth lens element 450 is made of plastic material, and has theobject-side surface 451 and the image-side surface 452 being bothaspheric.

The sixth lens element 460 with negative refractive power has anobject-side surface 461 being concave in a paraxial region thereof andan image-side surface 462 being concave in a paraxial region thereof.The sixth lens element 460 is made of plastic material, and has theobject-side surface 461 and the image-side surface 462 being bothaspheric. Furthermore, the image-side surface 462 of the sixth lenselement 460 includes at least one convex shape in an off-axial regionthereof.

The IR-cut filter 470 is made of glass material and located between thesixth lens element 460 and the image surface 480, and will not affect afocal length of the optical photographing lens assembly.

The detailed optical data of the 4th embodiment are shown in Table 7 andthe aspheric surface data are shown in Table 8 below.

TABLE 7 4th Embodiment f = 5.64 mm, Fno = 2.76, HFOV = 21.7 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.451  2 Lens 1 1.415 ASP 0.768Plastic 1.544 55.9 2.35 3 −10.702 ASP 0.039 4 Lens 2 10.138 ASP 0.240Plastic 1.639 23.5 −4.06 5 2.047 ASP 0.420 6 Lens 3 22.160 ASP 0.270Plastic 1.544 55.9 −16.79 7 6.440 ASP 0.808 8 Lens 4 −1.820 ASP 0.462Plastic 1.639 23.5 31.66 9 −1.835 ASP 0.076 10 Lens 5 −7.890 ASP 0.350Plastic 1.530 55.8 26.68 11 −5.142 ASP 0.368 12 Lens 6 −3.381 ASP 0.350Plastic 1.544 55.9 −5.96 13 80.989 ASP 0.600 14 IR-cut filter Plano0.400 Glass 1.517 64.2 — 15 Plano 0.227 16 Image Plano — Note: Referencewavelength is 587.6 nm (d-line).

TABLE 8 Aspheric Coefficients Surface # 2 3 4 5 6 7 k= −1.5073E−011.9375E+01 −4.9081E+01 −5.1300E−01 2.5942E+01 8.5348E+00 A4=  1.4642E−021.0740E−02 −9.2295E−02 −5.4122E−02 1.0154E−01 1.1837E−01 A6= −6.7770E−031.5971E−01  3.7743E−01  3.8940E−01 9.0921E−02 1.0854E−01 A8=  3.4777E−02−3.2804E−01  −6.5307E−01 −5.2162E−01 1.2872E−02 −1.6226E−01  A10=−3.6521E−02 3.4322E−01  6.7728E−01  8.0347E−01 4.4461E−02 3.1892E−01A12=  2.0143E−02 −1.4485E−01  −3.1982E−01 −4.6100E−01 −7.9466E−02 −2.0711E−01  Surface # 8 9 10 11 12 13 k=  0.0000E+00 0.0000E+00 3.0885E+01 −1.1230E+01 −1.1827E+01 −4.4060E+01 A4= −2.1207E−03−3.6662E−02  −8.5730E−02  6.7516E−05 −1.1807E−01 −1.4347E−01 A6=−3.3690E−02 2.0063E−03 −3.5880E−02 −6.9422E−02  8.6359E−02  8.2253E−02A8= −8.0584E−03 9.3315E−04 −8.3046E−03  1.7778E−02 −4.6432E−02−3.6962E−02 A10=  8.1617E−03 −2.6258E−04   2.4120E−02  4.7569E−03 1.2504E−02  1.0430E−02 A12=  5.8784E−03 2.8218E−04 −5.1175E−03−1.7338E−03 −1.1675E−03 −1.9011E−03 A14= −8.4192E−03 8.5362E−04 1.7305E−04

In the 4th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 4th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 7 and Table 8 asthe following values and satisfy the following conditions:

4th Embodiment f [mm] 5.64 SL/TL 0.92 Fno 2.76 f/ImgH 2.47 HFOV [deg.]21.7 TL/f 0.95 Dr1s/Dsr2 1.42 R10/f −0.91 ΣAT/(T12 + T23) 3.73

Moreover, in the optical photographing lens assembly according to the4th embodiment, when an Abbe number of the first lens element 410 is V1,an Abbe number of the second lens element 420 is V2, an Abbe number ofthe third lens element 430 is V3, an Abbe number of the fourth lenselement 440 is V4, an Abbe number of the fifth lens element 450 is V5,and an Abbe number of the sixth lens element 460 is V6, wherein at leasttwo of the V1, V2, V3, V4, V5 and V6 are smaller than 27, and in the 4thembodiment, V2 and V4 are smaller than 27.

5th Embodiment

FIG. 9 is a schematic view of an image capturing device according to the5th embodiment of the present disclosure. FIG. 10 shows sphericalaberration curves, astigmatic field curves and a distortion curve of theimage capturing device according to the 5th embodiment. In FIG. 9 , theimage capturing device includes an optical photographing lens assembly(its reference numeral is omitted) and an image sensor 590. The opticalphotographing lens assembly includes, in order from an object side to animage side, an aperture stop 500, a first lens element 510, a secondlens element 520, a third lens element 530, a fourth lens element 540, afifth lens element 550, a sixth lens element 560, an IR-cut filter 570,a cover glass 575 and an image surface 580, wherein the image sensor 590is disposed on the image surface 580 of the optical photographing lensassembly. The optical photographing lens assembly has a total of sixlens elements (510-560) with refractive power. There is an air space ina paraxial region between any two of the first lens element 510, thesecond lens element 520, the third lens element 530, the fourth lenselement 540, the fifth lens element 550, and the sixth lens element 560that are adjacent to each other, and there is no relative movement amongthe lens elements (510-560) with refractive power.

The first lens element 510 with positive refractive power has anobject-side surface 511 being convex in a paraxial region thereof and animage-side surface 512 being convex in a paraxial region thereof. Thefirst lens element 510 is made of plastic material, and has theobject-side surface 511 and the image-side surface 512 being bothaspheric. Furthermore, the object-side surface 511 of the first lenselement 510 has at least one inflection point.

The second lens element 520 with negative refractive power has anobject-side surface 521 being concave in a paraxial region thereof andan image-side surface 522 being concave in a paraxial region thereof.The second lens element 520 is made of plastic material, and has theobject-side surface 521 and the image-side surface 522 being bothaspheric. Furthermore, the object-side surface 521 of the second lenselement 520 has at least one inflection point.

The third lens element 530 with negative refractive power has anobject-side surface 531 being convex in a paraxial region thereof and animage-side surface 532 being concave in a paraxial region thereof. Thethird lens element 530 is made of plastic material, and has theobject-side surface 531 and the image-side surface 532 being bothaspheric.

The fourth lens element 540 with negative refractive power has anobject-side surface 541 being convex in a paraxial region thereof and animage-side surface 542 being concave in a paraxial region thereof. Thefourth lens element 540 is made of plastic material, and has theobject-side surface 541 and the image-side surface 542 being bothaspheric. Furthermore, the object-side surface 541 of the fourth lenselement 540 has at least one inflection point.

The fifth lens element 550 with positive refractive power has anobject-side surface 551 being concave in a paraxial region thereof andan image-side surface 552 being convex in a paraxial region thereof. Thefifth lens element 550 is made of plastic material, and has theobject-side surface 551 and the image-side surface 552 being bothaspheric. Furthermore, both of the object-side surface 551 and theimage-side surface 552 of the fifth lens element 550 have at least oneinflection point.

The sixth lens element 560 with negative refractive power has anobject-side surface 561 being convex in a paraxial region thereof and animage-side surface 562 being concave in a paraxial region thereof. Thesixth lens element 560 is made of plastic material, and has theobject-side surface 561 and the image-side surface 562 being bothaspheric. Furthermore, the image-side surface 562 of the sixth lenselement 560 includes at least one convex shape in an off-axial regionthereof.

The IR-cut filter 570 and the cover glass 575 are made of glass materialand located between the sixth lens element 560 and the image surface 580in order, and will not affect a focal length of the opticalphotographing lens assembly.

The detailed optical data of the 5th embodiment are shown in Table 9 andthe aspheric surface data are shown in Table 10 below.

TABLE 9 5th Embodiment f = 5.96 mm, Fno = 2.23, HFOV = 22.4 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.511  2 Lens 1 1.936 ASP 1.097Plastic 1.544 55.9 2.92 3 −7.093 ASP 0.061 4 Lens 2 −29.566 ASP 0.250Plastic 1.650 21.5 −8.73 5 7.051 ASP 0.095 6 Lens 3 2.897 ASP 0.280Plastic 1.650 21.5 −12.11 7 2.037 ASP 0.545 8 Lens 4 9.246 ASP 0.280Plastic 1.544 55.9 −5.86 9 2.345 ASP 0.197 10 Lens 5 −23.104 ASP 0.340Plastic 1.650 21.5 9.20 11 −4.781 ASP 1.067 12 Lens 6 8.557 ASP 0.527Plastic 1.650 21.5 −11.09 13 3.819 ASP 0.200 14 IR-cut filter Plano0.300 Glass 1.517 64.2 — 15 Plano 0.100 16 Cover glass Plano 0.400 Glass1.517 64.2 — 17 Plano 0.252 18 Image Plano — Note: Reference wavelengthis 587.6 nm (d-line).

TABLE 10 Aspheric Coefficients Surface # 2 3 4 5 6 7 k=  3.7947E−01 2.4820E+01 −9.0000E+01  3.2091E+01 −1.3375E+00 −1.1365E+00  A4=−1.2114E−02 −1.7976E−01 −2.9206E−01 −1.4260E−01 −5.7876E−03 4.7289E−03A6=  1.8000E−02  5.2403E−01  7.3508E−01  2.6526E−01 −1.8637E−032.7692E−02 A8= −5.4637E−02 −7.3021E−01 −1.0227E+00 −3.2086E−01 2.0456E−02 2.6736E−02 A10=  7.2232E−02  6.2503E−01  8.8822E−01 2.2392E−01  3.9322E−03 5.4937E−03 A12= −5.3347E−02 −3.2410E−01−4.7233E−01 −6.5683E−02 −2.0117E−03 −6.7390E−03  A14=  2.0387E−02 9.1960E−02  1.4021E−01 −3.5582E−03 −1.4591E−03 −1.2641E−03  A16=−3.2846E−03 −1.0748E−02 −1.7533E−02  4.8760E−03  1.4401E−03 6.8597E−03Surface # 8 9 10 11 12 13 k=  5.5005E+01 −2.8299E+01  9.0000E+014.2798E+00 −3.3500E+01 −5.1032E+01 A4= −1.7243E−01  5.9883E−02−8.5047E−02 −4.1521E−02  −1.7684E−01 −1.1050E−01 A6=  2.4436E−01 3.0300E−02  4.8796E−01 2.4538E−01  1.5670E−01  6.9226E−02 A8=−4.7993E−01 −2.4569E−01 −8.8116E−01 −2.8695E−01  −1.0610E−01 −3.4210E−02A10=  7.8261E−01  4.3032E−01  9.4917E−01 2.0861E−01  4.6932E−02 1.0347E−02 A12= −7.4660E−01 −3.5251E−01 −5.8749E−01 −7.5748E−02 −1.2877E−02 −1.8292E−03 A14=  3.6256E−01  1.3637E−01  1.9215E−019.6842E−03  1.9744E−03  1.6542E−04 A16= −6.9942E−02 −2.0849E−02−2.6354E−02 1.9078E−04 −1.2703E−04 −5.4109E−06

In the 5th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 5th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 9 and Table 10as the following values and satisfy the following conditions:

5th Embodiment f [mm] 5.96 SL/TL 0.91 Fno 2.23 f/ImgH 2.03 HFOV [deg.]22.4 TL/f 1.01 Dr1s/Dsr2 0.87 R10/f −0.80 ΣAT/(T12 + T23) 12.60

Moreover, in the optical photographing lens assembly according to the5th embodiment, when an Abbe number of the first lens element 510 is V1,an Abbe number of the second lens element 520 is V2, an Abbe number ofthe third lens element 530 is V3, an Abbe number of the fourth lenselement 540 is V4, an Abbe number of the fifth lens element 550 is V5,and an Abbe number of the sixth lens element 560 is V6, wherein at leasttwo of the V1, V2, V3, V4, V5 and V6 are smaller than 27, and in the 5thembodiment, V2, V3, V5 and V6 are smaller than 27.

6th Embodiment

FIG. 11 is a schematic view of an image capturing device according tothe 6th embodiment of the present disclosure. FIG. 12 shows sphericalaberration curves, astigmatic field curves and a distortion curve of theimage capturing device according to the 6th embodiment. In FIG. 11 , theimage capturing device includes an optical photographing lens assembly(its reference numeral is omitted) and an image sensor 690. The opticalphotographing lens assembly includes, in order from an object side to animage side, an aperture stop 600, a first lens element 610, a secondlens element 620, a third lens element 630, a fourth lens element 640, afifth lens element 650, a sixth lens element 660, an IR-cut filter 670and an image surface 680, wherein the image sensor 690 is disposed onthe image surface 680 of the optical photographing lens assembly. Theoptical photographing lens assembly has a total of six lens elements(610-660) with refractive power. There is an air space in a paraxialregion between any two of the first lens element 610, the second lenselement 620, the third lens element 630, the fourth lens element 640,the fifth lens element 650, and the sixth lens element 660 that areadjacent to each other, and there is no relative movement among the lenselements (610-660) with refractive power.

The first lens element 610 with positive refractive power has anobject-side surface 611 being convex in a paraxial region thereof and animage-side surface 612 being convex in a paraxial region thereof. Thefirst lens element 610 is made of plastic material, and has theobject-side surface 611 and the image-side surface 612 being bothaspheric. Furthermore, the image-side surface 612 of the first lenselement 610 has at least one inflection point.

The second lens element 620 with negative refractive power has anobject-side surface 621 being concave in a paraxial region thereof andan image-side surface 622 being concave in a paraxial region thereof.The second lens element 620 is made of plastic material, and has theobject-side surface 621 and the image-side surface 622 being bothaspheric. Furthermore, both of the object-side surface 621 and theimage-side surface 622 of the second lens element 620 have at least oneinflection point.

The third lens element 630 with negative refractive power has anobject-side surface 631 being convex in a paraxial region thereof and animage-side surface 632 being concave in a paraxial region thereof. Thethird lens element 630 is made of plastic material, and has theobject-side surface 631 and the image-side surface 632 being bothaspheric. Furthermore, the object-side surface 631 of the third lenselement 630 has at least one inflection point.

The fourth lens element 640 with negative refractive power has anobject-side surface 641 being convex in a paraxial region thereof and animage-side surface 642 being concave in a paraxial region thereof. Thefourth lens element 640 is made of plastic material, and has theobject-side surface 641 and the image-side surface 642 being bothaspheric. Furthermore, the object-side surface 641 of the fourth lenselement 640 has at least one inflection point.

The fifth lens element 650 with negative refractive power has anobject-side surface 651 being concave in a paraxial region thereof andan image-side surface 652 being convex in a paraxial region thereof. Thefifth lens element 650 is made of plastic material, and has theobject-side surface 651 and the image-side surface 652 being bothaspheric. Furthermore, the object-side surface 651 of the fifth lenselement 650 has at least one inflection point.

The sixth lens element 660 with positive refractive power has anobject-side surface 661 being convex in a paraxial region thereof and animage-side surface 662 being concave in a paraxial region thereof. Thesixth lens element 660 is made of plastic material, and has theobject-side surface 661 and the image-side surface 662 being bothaspheric. Furthermore, the image-side surface 662 of the sixth lenselement 660 includes at least one convex shape in an off-axial regionthereof.

The IR-cut filter 670 is made of glass material and located between thesixth lens element 660 and the image surface 680, and will not affect afocal length of the optical photographing lens assembly.

The detailed optical data of the 6th embodiment are shown in Table 11and the aspheric surface data are shown in Table 12 below.

TABLE 11 6th Embodiment f = 6.10 mm, Fno = 2.23, HFOV = 22.4 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.650  2 Lens 1 1.735 ASP 1.244Plastic 1.544 55.9 2.81 3 −9.747 ASP 0.050 4 Lens 2 −42.502 ASP 0.250Plastic 1.639 23.5 −4.96 5 3.436 ASP 0.050 6 Lens 3 2.840 ASP 0.280Plastic 1.639 23.5 −24.65 7 2.314 ASP 0.735 8 Lens 4 35.286 ASP 0.280Plastic 1.544 55.9 −7.59 9 3.686 ASP 0.206 10 Lens 5 −3.363 ASP 0.340Plastic 1.639 23.5 −203.46 11 −3.589 ASP 0.305 12 Lens 6 3.628 ASP 0.614Plastic 1.639 23.5 19.30 13 4.800 ASP 0.500 14 IR-cut filter Plano 0.300Glass 1.517 64.2 — 15 Plano 0.833 16 Image Plano — Note: Referencewavelength is 587.6 nm (d-line).

TABLE 12 Aspheric Coefficients Surface # 2 3 4 5 6 7 k=  2.1702E−01−8.8681E+00 −9.0000E+01  2.6828E−01 −2.8095E+00 −6.1153E−01 A4=−1.0567E−02 −1.9046E−01 −2.8245E−01 −1.4732E−01 −2.6793E−02  9.0442E−04A6=  2.1052E−02  5.2434E−01  7.3202E−01  2.6295E−01 −2.0693E−02 9.1173E−02 A8= −5.7491E−02 −7.3043E−01 −1.0249E+00 −3.2461E−01 2.2285E−03 −2.5411E−01 A10=  7.3458E−02  6.2212E−01  8.9174E−01 2.1809E−01 −1.5008E−02  4.4494E−01 A12= −5.3025E−02 −3.2186E−01−4.7157E−01 −6.9822E−02 −3.9300E−03 −4.0791E−01 A14=  1.9989E−02 9.0264E−02  1.3435E−01 −9.8000E−03  1.8867E−01 A16= −3.1967E−03−1.0081E−02 −1.4232E−02  1.1080E−02 −3.1121E−02 Surface # 8 9 10 11 1213 k= −9.0000E+01 −9.0000E+01 −8.8179E+01  2.8303E+00 −3.4319E+01−1.3097E+01 A4= −1.6956E−01  8.1436E−02 −1.9743E−01 −1.4546E−01−2.2522E−01 −1.6064E−01 A6=  1.7129E−01 −3.1562E−02  7.4894E−01 3.1016E−01  1.7874E−01  9.7712E−02 A8= −4.4622E−01 −2.2799E−01−1.1991E+00 −2.2718E−01 −8.0250E−02 −4.4608E−02 A10=  8.0148E−01 4.3806E−01  1.1283E+00  9.7856E−02  2.3186E−02  1.5078E−02 A12=−7.5357E−01 −3.5251E−01 −6.2312E−01 −1.6984E−02 −4.7649E−03 −3.5419E−03A14=  3.5542E−01  1.3565E−01  1.8645E−01 −2.1277E−03  7.0964E−04 4.8806E−04 A16= −6.6293E−02 −2.0577E−02 −2.3459E−02  8.0872E−04−5.5612E−05 −2.9109E−05

In the 6th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 6th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 11 and Table 12as the following values and satisfy the following conditions:

6th Embodiment f[mm] 6.10 SL/TL 0.89 Fno 2.23 f/ImgH 2.08 HFOV [deg.]22.4 TL/f 0.98 Dr1s/Dsr2 1.09 R10/f −0.59 ΣAT/(T12 + T23) 13.46

Moreover, in the optical photographing lens assembly according to the6th embodiment, when an Abbe number of the first lens element 610 is V1,an Abbe number of the second lens element 620 is V2, an Abbe number ofthe third lens element 630 is V3, an Abbe number of the fourth lenselement 640 is V4, an Abbe number of the fifth lens element 650 is V5,and an Abbe number of the sixth lens element 660 is V6, wherein at leasttwo of the V1, V2, V3, V4, V5 and V6 are smaller than 27, and in the 6thembodiment, V2, V3, V5 and V6 are smaller than 27.

7th Embodiment

FIG. 14 is a schematic view of an electronic device 10 according to the7th embodiment of the present disclosure. The electronic device 10 ofthe 7th embodiment is a smart phone, wherein the electronic device 10includes an image capturing device 11. The image capturing device 11includes an optical photographing lens assembly (its reference numeralis omitted) according to the present disclosure and an image sensor (itsreference numeral is omitted), wherein the image sensor is disposed onan image surface of the optical photographing lens assembly.

8th Embodiment

FIG. 15 is a schematic view of an electronic device 20 according to the8th embodiment of the present disclosure. The electronic device 20 ofthe 8th embodiment is a tablet personal computer, wherein the electronicdevice 20 includes an image capturing device 21. The image capturingdevice 21 includes an optical photographing lens assembly (its referencenumeral is omitted) according to the present disclosure and an imagesensor (its reference numeral is omitted), wherein the image sensor isdisposed on an image surface of the optical photographing lens assembly.

9th Embodiment

FIG. 16 is a schematic view of an electronic device 30 according to the9th embodiment of the present disclosure. The electronic device 30 ofthe 9th embodiment is a head-mounted display (HMD), wherein theelectronic device 30 includes an image capturing device 31. The imagecapturing device 31 includes an optical photographing lens assembly (itsreference numeral is omitted) according to the present disclosure and animage sensor (its reference numeral is omitted), wherein the imagesensor is disposed on an image surface of the optical photographing lensassembly.

The foregoing description, for purpose of explanation, has beendescribed with reference to specific embodiments. It is to be noted thatTABLES 1-12 show different data of the different embodiments; however,the data of the different embodiments are obtained from experiments. Theembodiments were chosen and described in order to best explain theprinciples of the disclosure and its practical applications, to therebyenable others skilled in the art to best utilize the disclosure andvarious embodiments with various modifications as are suited to theparticular use contemplated. The embodiments depicted above and theappended drawings are exemplary and are not intended to be exhaustive orto limit the scope of the present disclosure to the precise formsdisclosed. Many modifications and variations are possible in view of theabove teachings.

What is claimed is:
 1. An optical photographing lens assemblycomprising, in order from an object side to an image side: a first lenselement with positive refractive power having an object-side surfacebeing convex in a paraxial region thereof; a second lens element; athird lens element; a fourth lens element; a fifth lens element; and asixth lens element having an object-side surface and an image-sidesurface being both aspheric, wherein the image-side surface of the sixthlens element comprises at least one inflection point; wherein there isan air space between adjacent lens elements of the lens elements; acentral thickness of the first lens element is a maximum among centralthicknesses of the lens elements of the optical photographing lensassembly; curvature radii of an object-side surface and an image-sidesurface of the fourth lens element have a same sign; wherein an Abbenumber of the first lens element is V1, an Abbe number of the secondlens element is V2, an Abbe number of the third lens element is V3, anAbbe number of the fourth lens element is V4, an Abbe number of thefifth lens element is V5, an Abbe number of the sixth lens element isV6, and at least two of the V1, V2, V3, V4, V5 and V6 are smaller than27; wherein a half of a maximal field of view of the opticalphotographing lens assembly is HFOV, and the following condition issatisfied:10.0 degrees<HFOV<25.0 degrees.
 2. The optical photographing lensassembly of claim 1, wherein the third lens element has an image-sidesurface being concave in a paraxial region thereof.
 3. The opticalphotographing lens assembly of claim 1, wherein the second lens elementwith negative refractive power has an object-side surface being convexin a paraxial region thereof and an image-side surface being concave ina paraxial region thereof.
 4. The optical photographing lens assembly ofclaim 1, wherein the fifth lens element has positive refractive power,curvature radii of an object-side surface and an image-side surface ofthe fifth lens element have a same sign.
 5. The optical photographinglens assembly of claim 1, wherein at least three of the lens elements ofthe optical photographing lens assembly have negative refractive power;the half of a maximal field of view of the optical photographing lensassembly is HFOV, and the following condition is satisfied:10.0 degrees<HFOV<21.7 degrees.
 6. The optical photographing lensassembly of claim 1, wherein each of at least three of object-sidesurfaces and image-side surfaces of the first lens element, the secondlens element, the third lens element, the fourth lens element, and thefifth lens element of the optical photographing lens assembly comprisesat least one inflection point.
 7. The optical photographing lensassembly of claim 1, wherein both of object-side surface and image-sidesurface of each of the second lens element, the third lens element andthe fourth lens element are aspheric; the second lens element, the thirdlens element, the fourth lens element, the fifth lens element and thesixth lens element are made of plastic material; an axial distancebetween the fifth lens element and the sixth lens element is greaterthan an axial distance between the fourth lens element and the fifthlens element.
 8. The optical photographing lens assembly of claim 1,wherein focal lengths of the second lens element and the fifth lenselement have different signs.
 9. The optical photographing lens assemblyof claim 1, wherein an axial distance between the third lens element andthe fourth lens element is smaller than an axial distance between theimage-side surface of the sixth lens element and an image surface. 10.The optical photographing lens assembly of claim 1, wherein an absolutevalue of a curvature radius of an object-side surface of the first lenselement is smaller than an absolute value of a curvature radius of animage-side surface of the first lens element.
 11. An image capturingdevice, comprising: the optical photographing lens assembly of claim 1;and an image sensor disposed on an image surface of the opticalphotographing lens assembly.
 12. An electronic device, comprising: theimage capturing device of claim
 11. 13. An optical photographing lensassembly comprising, in order from an object side to an image side: afirst lens element with positive refractive power having an object-sidesurface being convex in a paraxial region thereof; a second lenselement; a third lens element having an object-side surface being convexin a paraxial region thereof; a fourth lens element; a fifth lenselement; and a sixth lens element having an image-side surface beingaspheric, wherein the image-side surface of the sixth lens elementcomprises at least one inflection point; wherein the opticalphotographing lens assembly further comprises an aperture stop disposedbetween an imaged object and the third lens element; a central thicknessof the first lens element is a maximum among central thicknesses of thelens elements of the optical photographing lens assembly; wherein a halfof a maximal field of view of the optical photographing lens assembly isHFOV, and the following condition is satisfied:10.0 degrees<HFOV<25.0 degrees.
 14. The optical photographing lensassembly of claim 13, wherein the sixth lens element has an object-sidesurface being concave in a paraxial region thereof.
 15. The opticalphotographing lens assembly of claim 13, wherein the fourth lens elementhas an object-side surface being concave in a paraxial region thereofand an image-side surface being convex in a paraxial region thereof. 16.The optical photographing lens assembly of claim 13, wherein the secondlens element with negative refractive power has an object-side surfacebeing convex in a paraxial region thereof and an image-side surfacebeing concave in a paraxial region thereof.
 17. The opticalphotographing lens assembly of claim 13, wherein each of at least threeof object-side surfaces and image-side surfaces of the first lenselement, the second lens element, the third lens element, the fourthlens element, and the fifth lens element of the optical photographinglens assembly comprises at least one inflection point.
 18. The opticalphotographing lens assembly of claim 13, wherein there is an air spacebetween adjacent lens elements of the lens elements; the sixth lenselement has an object-side surface being aspheric; an absolute value ofa curvature radius of an image-side surface of the second lens elementis smaller than an absolute value of a curvature radius of anobject-side surface of the third lens element.
 19. The opticalphotographing lens assembly of claim 13, wherein curvature radii of anobject-side surface and an image-side surface of the fourth lens elementhave a same sign; curvature radii of an object-side surface and animage-side surface of the fifth lens element have a same sign.
 20. Theoptical photographing lens assembly of claim 13, wherein the centralthickness of the first lens element is greater than each of axialdistances between adjacent lens elements of the lens elements of theoptical photographing lens assembly.
 21. The optical photographing lensassembly of claim 13, wherein an absolute value of a focal length of thesecond lens element is smaller than an absolute value of a focal lengthof the sixth lens element.